a framework for lean manufacturing implementation
TRANSCRIPT
A framework for lean manufacturing implementation
Author
Mostafa, S, Dumrak, J, Soltan, H
Published
2013
Journal Title
Production & Manufacturing Research
Version
Version of Record (VoR)
DOI
https://doi.org/10.1080/21693277.2013.862159
Copyright Statement
© 2013 The Author(s). Published by Taylor & Francis. This is an open-access article distributedunder the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/3.0/, which permits unrestricted use, distribution, and reproduction in any medium,provided the original work is properly cited. The moral rights of the named author(s) have beenasserted.
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A framework for lean manufacturing implementation
Sherif Mostafaa*, Jantanee Dumraka and Hassan Soltanb
aSchool of Natural and Built Environments, University of South Australia, Adelaide 5000,Australia; bFaculty of Engineering, Production Engineering and Mechanical Design Department,Mansoura University, Mansoura 35516, Egypt
(Received 25 June 2013; accepted 31 October 2013)
The lean implementation initiatives can be categorised as roadmap, conceptual/implementation framework, descriptive and assessment checklist initiatives. A litera-ture review on the lean initiatives has examined 28 initiatives. A set of rules isproposed to evaluate these initiatives with respect to nine factors impacting leanimplementation. The evaluation has proved that the implementation frameworks havehighest association with lean factors. However, existing lean initiatives are not dem-onstrated in a structured nature. The failure in managing lean implementation processis often consolidated to poor mind-set and inadequate understanding of the leanconcept itself. In this paper, an attempt has been made to propose a framework toovercome some of the limitations. The proposed framework is constructed as aproject-based framework with detailed four implementation phases. Appropriatepractices and decision tools are proposed and assigned to each phase. However, theproposed framework is at conceptual stage. It requires further implementation to bevalidated.
Keywords: lean manufacturing; lean implementation initiatives; success factors oflean implementation; implementation framework; initiative evaluation rules
1. Introduction
Lean manufacturing is an integrated sociotechnical system, which comprises a packageof management practices that can be applied to eliminate the waste and reduce the vari-ability of suppliers, customers and internal resources and processes (Anvari, Zulkifli,Yusuff, Ismail, & Hojjati, 2011; Shah, Chandrasekaran, & Linderman, 2008). Leanconcept has been widely accepted in the service and manufacturing industries. Numer-ous literatures have reviewed the lean benefits and applications. The term lean was firstcoined by Krafcik (1988). Subsequently, Womack, Jones, and Roos (1991) used theterm lean production to describe the Toyota production system (TPS).
Womack and Jones (2003) stated that lean principles can be applied in any industry.Different types of organisations have implemented lean manufacturing. Nevertheless,Marvel and Standridge (2009) argued that few organisations attain significant improve-ments by applying lean. As the improvements remain localised, those organisations areunable to sustain the continuous improvements. Baker (2002) reported that the successpercentage of UK organisations on lean implementation is less than 10%. It is believedthat the main reason of unattainability of lean benefits is the incomplete understandingof the lean concept and the purpose of the lean practices. Some companies misapply the
*Corresponding author. Email: [email protected]
© 2013 The Author(s). Published by Taylor & FrancisThis is an open-access article distributed under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/3.0/, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is prop-erly cited. The moral rights of the named author(s) have been asserted.
Production & Manufacturing Research: An Open Access Journal, 2013Vol. 1, 44–64, http://dx.doi.org/10.1080/21693277.2013.862159
lean practices. The main reasons of the misapplications are as: ‘use of wrong tool tosolve a problem’, ‘use of single tool to solve all of the problems’ and ‘use the same setof tools on each problem’ (Pavnaskar, Gershenson, & Jambekar, 2003, p. 3077).Incorrect application of lean concept leads to waste of the organisational resources andreduction in employees’ confidence in practising lean (Marvel & Standridge, 2009). It issuggested that scope and content of lean manufacturing should be holistically verifiedprior to any lean implementation (Crute, Ward, Brown, & Graves, 2003).
Some managers and employees presumed that the factor behind Toyota success wasabout the cultural roots, but not lean practices. Despite criticism raised by other organi-sational management, Toyota as a successful leading organisation in lean application hasdemonstrated high performance with its production system established in all multina-tional manufacturing sites (Wafa & Yasin, 1998). Although lean benefits are extensivelyrecognised from Toyota’s success stories, the current roadmaps and frameworks lookincomprehensible from the view of practitioners. Complications of lean implementationare believed to be driven by executive, cultural, managerial, implementation and techni-cal barriers (Flinchbaugh, 1998). Therefore, the aim of this paper was to propose a com-prehensive project-based implementation framework for lean transition in a practicalmanner. The proposed framework was built as a project-based implementation approachof detailed four phases. The paper anticipates enhancing the lean transformation processthrough the implementation framework proposed. To achieve the aim of this paper, thefollowing four objectives were developed:
(1) To investigate lean implementation initiatives.(2) To highlight the success factors for lean implementation.(3) To evaluate different lean initiatives with respect to the success factors.(4) To develop a framework for lean implementation containing the success factors.
The structure of this paper is organised into seven sections. After the introduction,the second section summarises the research methodology. The third section reviews theexisting lean implementation initiatives. The fourth section attempts to quantify successfactors of lean implementation. The fifth section presents a set of rules to assess the leaninitiatives. The sixth section introduces a comprehensive structured framework for leanimplementation. The last section discusses implication of the framework proposed andconcludes the research objectives along with recommendations for further research.
2. Methodology
This paper aims to provide a more meaningful and effective path for lean transitionwithin an organisation. To achieve the aim of this paper, four objectives were developedas illustrated in the previous section. Lean implementation initiatives werecross-examined through reviewing the literature. The main success factors for lean imple-mentation were highlighted. Reviewing all lean initiatives was not feasible, however asfar as possible the most widely published and relevant initiatives were reviewed in thispaper. According to Cooper (1988), it is suggested that the literature review can be elabo-rated based on the purposive selection approach in which only related articles pivotal tothe research topic were chosen to be reviewed. It means that the selected literature reviewspecifically focused on the presentation of lean initiatives and process description.
Green, Johnson, and Adams (2006) stated that the most efficient way for searchingthe literature is the electronic databases. There are many different databases available
Production & Manufacturing Research: An Open Access Journal 45
for searching. Therefore, it is important to search the appropriate databases that servethe objectives and the topic of the paper. There are publications that conducted a litera-ture review to propose a roadmap and conceptual framework for lean implementation(Anand & Kodali, 2010; Anvari et al., 2011). In this research, the literature review andselection of the appropriate sources on lean implementation initiatives were conductedin two stages. The first stage aimed to search for relevant databases and select therelevant publications. The inclusive databases were Emerald, Elsevier, Springer,Science-direct, IOS Press, EBSCO Host Academic Search Premier, Inderscience, WorldScientific, Academic Journals, Journal of Industrial Engineering and Management,American Society for Engineering Management and book publications. The filteringprocess of the selected databases utilised combinations of keywords to search for thearticle titles. The key words used for the search included ‘lean manufacturing implemen-tation’, ‘lean transformation’, ‘transition to lean’, ‘lean framework’, ‘lean roadmap’ or‘applying lean’. Seventy publications which contained information relevant to leanmanufacturing implementation were obtained at this stage.
The second stage involved scrutinising the abstracts and keywords of the selectedarticles. It revealed that lean implementation concepts varied in the scope of study. Forexample, Smeds (1994) focused on managing change towards lean enterprise; Jina,Bhattacharya, and Walton (1997) focused on applying lean principles; Crabill et al.(2000) emphasised on transition-to-lean roadmap; Womack and Jones (2003) used timeframe for lean leap; Anand and Kodali (2010) developed a lean conceptual framework;Anvari, Norzima, Rosnay, Hojjati, and Ismail (2010) suggested a lean roadmap; andPowell, Alfnes, Strandhagen, and Dreyer (2013) introduced an ERP-based leanimplementation process. Some of the works came from various areas of knowledge anddisciplines such as simulation and training for lean implementation, impacts of leanimplementation on the competitive advantage, management accounting systems impactson lean implementations and lean principles in IT services. As a result, 28 articles withdifferent types of initiatives were eventually selected. The initiatives were found in theforms of sequential description, diagrams and assessment checklist. An in-depth studyinto each initiative was conducted to highlight the critical factors of lean implementa-tion. Proposing a set of rules to evaluate the lean initiatives with respect to the mainsuccess factors was included. The expected final outcome of the paper was to propose alean implementation framework in a project-based structure.
3. Review of lean implementation initiatives
There have been various lean implementation initiatives proposed in previous researchstudies. The initiatives could be grouped into five categories: conceptual frameworks,implementation frameworks, roadmaps, descriptive and assessment checklist. The classi-fication of these categories results from the name and characteristics of each initiativegiven in the literature. Some research studies may depict their implementation processas descriptive style. For example, Jina et al. (1997) suggested a descriptive diagram inapplying lean principles to suit the high variety low volume situation. The diagram hasthree interrelated components: product design geared to logistics and manufacture,organising manufacturing along lean manufacturing principles and integrative supplierrelationships. Womack and Jones (2003) described a time framework for a lean leap. Itincludes four phases: get start, create a new organisation, install business systems andcomplete the transformation. Shah and Ward (2003) defined the success of lean
46 S. Mostafa et al.
implementation as it depends on three organisational factors: plant age, plant size andunionisation.
Other scholars have identified some guidelines for the implementation process.Karlsson and Åhlström (1996) developed an operational model which can be used toassess changes required to introduce lean manufacturing. Abdulmalek, Rajgopal, andNeedy (2006) provided a general set of guidelines about the applicability of some leanpractices in the process industry. Davies and Greenough (2010) developed a lean prac-tice template. They claimed that it is comprehensive enough to represent possible leanactivities within a company and particularly in the maintenance function. Some studieshave used roadmaps for the lean transformation. Nightingale and Mize (2002) developeda transition to lean roadmap to assist organisations in their efforts to transform into leanenterprises. Feld (2001) proposed a streamlined roadmap for lean manufacturing throughfour phases: lean assessment, current state gap, future state gap and implementation.Marvel and Standridge (2009) enhanced Feld’s roadmap by suggesting five phaseroadmap including future state validation. Anvari et al. (2011) developed a dynamicroadmap determining the tools needed to be implemented in a firm based on its currentstate and type of industry.
In many scholarly works, the use of a diagrammed framework for representing theimplementation process has been made available. Smeds (1994) proposed a genericframework for the management of changes towards lean enterprise. This frameworkconsists of five phases such as analysis and model of the present state, identification ofproblems and opportunities, experimentation and selection of future state, implementingthe change and stabilising the new mode of operations. Monden (1998) introduced aconceptual framework that describes how costs, quantity and humanity are improved byTPS. Åhlström (1998) noted that lean manufacturing consists of eight principles: elimi-nation of waste, zero defects, pull scheduling, multifunctional teams, delayering, teamleaders, vertical information systems and continuous improvement. He developed aframework for sequencing the lean production principles in the implementation process.Rivera and Frank Chen (2007) developed a logical and easy to understand frameworkfor lean implementation. They grouped, into four waves, the lean practices that havemore visible impact on the investment. Motwani (2003) developed a theoretical frame-work based on business process change. Anand and Kodali (2010) established a concep-tual framework to demonstrate 65 lean elements, the internal stakeholders and decisionlevels. Mostafa (2011) constructed an implementation framework for lean manufacturingin 15 stages. Two newly introduced frameworks came from Karim and Arif-Uz-Zaman(2013) and Powell et al. (2013). Karim and Arif-Uz-Zaman (2013) developed a method-ology for lean implementation based on the five lean principles. Powell et al. (2013)combined the methodologies for lean manufacturing and Enterprise Resource Planning(ERP) and proposed ERP-based lean implementation process. The study suggested thatERP implementation could be considered as an enabler for the lean implementation inan enterprise. Only one study by Sánchez and Pérez (2001) introduces lean productionassessment checklist in six groups providing 36 indicators to assess the manufacturingchanges according to the lean production principles.
The most successful lean initiatives are those which have been introduced as roadm-aps and frameworks. Some of them represent conceptual guidelines for providing infor-mation on the lean structure both in practices and principles. Others provide outlines forthe lean implementation process. However, low utilisation of lean initiatives and slowsuccess rate of lean transformation process have been reported (Anand & Kodali, 2010;
Production & Manufacturing Research: An Open Access Journal 47
Nordin, Deros, Wahab, & Rahman, 2012). It is assumed that such initiatives are notconsiderably comprehensive to the practitioners (Mohanty, Yadav, & Jain, 2007). Thisleads to a wrong mind-set on lean transformation. A successful initiative should com-prise of, in its first stage, a tutorial segment such as lessons learned documentation andreview, and a personnel communication segment. The communication segment onlyappears at end such as in Smeds (1994). Moreover, an expert team should be involved,beside the internal team to ensure an effective plan of lean implementation (Womack &Jones, 2003). In most organisations, the lean implementation team is new to the leanconcept. The internal team members must have a considerable time to fully understandthe concept.
To promote universality and familiarisation of the lean concept, simplified andcomprehensive implementation frameworks become necessary. The robustness is alsoprovided if a framework is built in a practical structured form. In other words, the leantransformation process should be distributed as a complete project, where it is beingcarefully planned, executed, monitored, controlled, evaluated and documented forlessons learned.
4. Success factors for lean implementation
A lean concept is a set of principles to remove all forms of waste within anorganisation. Womack and Jones (2003) stated the five general principles of lean as:defining the value from customer perspective, mapping the value stream process toachieve the predefined value, creating the flow along the value chain, establishing pullsystem and pursuing perfection. Lean manufacturing system is a set of tools/techniquesto identify and remove the waste (Anvari et al., 2010). Lean tools represent the leanprinciples in an implementation form. The aim of each lean implementation initiativeprovides guidelines or discusses the steps required for lean transition. Each initiativeconsists of some elements/components that an organisation needs to follow to achievethe lean transformation process (see Table 1). Some organisations face challenges toapply lean using some of lean initiatives (Anvari et al., 2010). These challenges couldbe related to the lean initiatives or an organisational practice of lean initiatives. Chal-lenges of lean initiatives include category and elements of each initiative. Organisationalchallenges include all obstacles in the path of the lean implementation process such asexecutive, culture, management and technical issues (Taleghani, 2010). To successfullyovercome these challenges, some critical factors must be pertained to theimplementation process (Anvari et al., 2010).
To identifying the factors impacting lean implementation, this paper has conductedthree dimensions of identification. In this first dimension, the paper conducted anin-depth study of 28 initiatives to highlight the critical components of lean implementa-tion. The second dimension was to explore the previous studies emphasising some suc-cess factors of lean implementation including the studies of Achanga, Shehab, Roy, andNelder (2006), Scherrer-Rathje, Boyle, and Deflorin (2009) and Anvari et al. (2010).This paper aims to propose a framework for lean implementation as a project-basedimplementation approach. Therefore, the last dimension is the integration of leansuccess factors into a project-based framework. From reviewing the previous literature,the current study identifies nine relevant factors to achieve lean transition. A briefdescription of these factors is presented as follows.
48 S. Mostafa et al.
Table1.
Literature
review
summaryof
lean
implem
entatio
ninitiatives
andfactorsused
inthisstud
y.
Leanim
plem
entatio
ninitiative
Category
No.
ofelem
ents
Factors
impactinglean
manufacturing
implem
entatio
n
F1
F2
F3
F4
F5
F6
F7
F8
F9
1Planforintrod
ucingtheToy
otaprod
uctio
nsystem
(Shing
o,19
89)
Implem
entatio
nfram
ework
15*
*
2The
Generic
Framew
orkforthemanagem
entof
change
towards
lean
enterprise
(Smeds,19
94)
Implem
entatio
nfram
ework
6*
**
**
*
3Con
ceptualisationof
lean
prod
uctio
n(K
arlsson&
Åhlström,19
96)
Roadm
ap4
**
4The
compo
nentsnecessaryforapplying
lean
manufacturing
principles
(Jinaet
al.,19
97)
Descriptiv
e3
*
5How
costs,quantity,
quality,andhumanity
areim
proved
byTPS(M
onden,
1998
)Con
ceptualfram
ework
10*
6Sequences
intheIm
plem
entatio
nof
LeanProdu
ction
(Åhlström,19
98)
Roadm
ap8
**
*
7Transition
-To-
Leanin
prod
uctio
nop
erations
roadmap
(Crabillet
al.,20
00)
Roadm
ap8
**
**
*
8Leanmanufacturing
road
map
(Feld,
2001
)Roadm
ap5
**
**
*9
Alean
prod
uctio
nmod
el(Sánchez
&Pérez,20
01)
Assessm
entchecklist
5*
*10
Enterpriselevelroadmap
(Nightingale
&Mize,
2002)
Roadm
ap7
**
**
*11
Tim
efram
eforthelean
leap
(Wom
ack&
Jones,20
03)
Descriptiv
e4
**
12LeanIm
plem
entatio
nandcontextual
variables(Shah&
Ward,
2003)
Descriptiv
e3
13Theoretical
fram
eworkforlean
manufacturing
implem
entatio
n(M
otwani,20
03)
Con
ceptualFramew
ork
7*
**
**
14Leantransformation(Bicheno
,20
04)
Implem
entatio
nfram
ework
12*
**
**
**
15Disciplined
approach
tolean
manufacturing
(Hob
bs,20
04)
Disciplined
approach
(descriptiv
e)8
**
*
16General
guidelines
forapplying
lean
toolsin
theprocess
indu
stry
(Abd
ulmalek
etal.,20
06)
Guidelin
es(descriptiv
e)3
*
17Waves
oflean
implem
entatio
n(Rivera&
Frank
Chen,
2007
)Roadm
ap4
*
(Con
tinued)
Production & Manufacturing Research: An Open Access Journal 49
Table1.
(Con
tinued).
Leanim
plem
entatio
ninitiative
Category
No.
ofelem
ents
Factors
impactinglean
manufacturing
implem
entatio
n
F1
F2
F3
F4
F5
F6
F7
F8
F9
18Sim
ulationenhanced
approach
tolean
manufacturing
(Marvel
&Stand
ridg
e,20
09)
Streamlin
edapproach
(descriptiv
e)5
**
19Leanim
plem
entatio
nroadmap
forahigh
/low
volumehigh
/low
repetitiveness(W
an&
Chen,
2009)
Roadm
ap8
**
20Propo
sedfram
eworkforim
plem
entatio
nof
lean
manufacturing
system
(Anand
&Kodali,20
10)
Con
ceptual
fram
ework
9*
*
21A
prop
osed
dynamic
mod
elto
leanness
(Anv
ariet
al.,20
11)
Roadm
ap5
**
**
*
22Leanim
plem
entatio
nfram
ework(Buu
s,20
11)
Implem
entatio
nfram
ework
17*
**
**
*
23Leanmanufacturing
implem
entatio
nfram
ework(Cheng
Won
g&
Yew
Won
g,20
11)
Implem
entatio
nfram
ework
12*
**
24Framew
orkforlean
manufacturing
Implem
entatio
n(M
ostafa,
2011)
Implem
entatio
nfram
ework
15*
**
**
*
25Stepw
iseim
plem
entatio
nof
lean
prod
uctio
nsystem
s(D
ombrow
ski,Mielke,
&Schulze,20
12)
Implem
entatio
nfram
ework
9*
**
26Organisationalchange
fram
eworkin
lean
manufacturing
implem
entatio
n(N
ordinet
al.,20
12)
Implem
entatio
nfram
ework
8*
**
*
27Framew
orkforan
ERP-based
lean
implem
entatio
nprocess
(Pow
ellet
al.,20
13)
Implem
entatio
nfram
ework
24*
**
**
28Propo
sedlean
implem
entatio
nmetho
dology
(Karim
&Arif-
Uz-Zam
an,20
13)
Implem
entatio
nfram
ework
17*
**
**
Num
berof
resources
912
815
1716
112
4
50 S. Mostafa et al.
(1) Expert team building (F1) – the use of experienced team to provide advice andmanage the implementation process. The lean expert team is a key node in theprocess (Dombrowski, Mielke, & Engel, 2012). Teaming lean experts ensuredeep expertise. Hiring lean experts facilitates and promotes the change towardslean. Furthermore, the expert team provides the required training and consul-tancy to the practitioners. The recruitment of lean experts may be initiated eitherfrom an internal cross-functional team or external consultant team (Bamber &Dale, 2000; Womack & Jones, 2003).
(2) Situational analysis (F2) – an assessment of the current situations of an organi-sation. Internal assessment scans all organisational attributes such as personnel,facilities, location, products and services, in order to identify the organisation’sstrengths and weaknesses to apply lean. The external assessment scans the polit-ical, economic, social, technological and competitive environment to identifyingopportunities and threats (Lozano & Vallés, 2007) to lean practices. Thesituational analysis helps to define the gap between the expected outcomes andthe current situations.
(3) Lean communication planning (F3) – the communication management processeswith stakeholders at all levels. Puvanasvaran, Megat, Sai Hong, and MohdRazali (2009) stated that communication is an important aspect for a successfullean implementation. Appropriate communication among the employees facili-tates the lean implementation process. Miscommunication may lead to misunder-standing and misapplication of lean concept and tools. Moreover, it generates anambiguity in employee’s roles and responsibilities (Worley & Doolen, 2006).The study of Scherrer-Rathje et al. (2009) revealed that communicating the leanpilot project success increased the support from the shop floor and managers toexpand the lean practice.
(4) Training process (F4) – training programmes for the employees and managerson lean knowledge. The resistance to lean transformation among managers isusually caused by the lack of skills and lean knowledge (Barker, 1998). Like-wise, employees’ resistance to lean improvements is likely due to inadequatetraining and commitment (Crute et al., 2003). To overcome these problems, theorganisations should emphasise effective lean-related education and trainingprogrammes as well as establish training assessment to measure the trainingimpacts (Boyer, 1996; Pollitt, 2006).
(5) Lean tools (F5) – a handmaiden of the implementation process. These tools needto be integrated into the practice in order to deliver a streamlined and high-qual-ity process of transformation (Shah & Ward, 2003). It is suggested by Pavnaskaret al. (2003) that insufficiency of understanding lean tools and their utilisationresults in misapplications and ineffectiveness. Moreover, the appropriate selec-tion of lean tools contributes to better waste elimination decisions. It is remindedthat not all lean tools can solve the same problem, and not all problems can besolved by a single tool.
(6) Value Stream Mapping (VSM) or Process Mapping (F6) – highlighting severalkinds of problems in the processes (Rother & Shook, 1999). Lean principlesrequire manufacturers to investigate their processes and identify the value-addedand non-value-added activities (wastes). Process mapping supports lean transfor-mation by identifying opportunities for waste elimination (Cottyn, Landeghem,
Production & Manufacturing Research: An Open Access Journal 51
Stockman, & Derammelaere, 2011). VSM is employed to identify the areas thatneed to be improved and to decide the wastes to be eliminated (Pavnaskar et al.,2003).
(7) Lessons Learned Review (F7) – reviewing the past records of lean implementa-tions. The review should be conducted prior to initiation of the standardised leanpractices. According to Feld (2001), capturing lessons learned from a previousimplementation stage is significant for a subsequent stage. Lessons can beobtained from inside or outside an organisation. Lessons-learned documentationkeeps data, information and knowledge for future review.
(8) Lean Assessment (F8) – evaluating the lean practice in different areas to providea baseline for the organisation. It contains a set of metrics used for tracking thelevel of lean implementation efforts. Doolen and Hacker (2005) suggested thatlean assessment should include tactical and strategic modules. According to Feld(2001), lean assessment provides an overall index of lean performance score ofan organisation. Understanding the lean index can contribute to successful leanimplementation as it provides authentic results for lean performance and directsdecision-makers to corrective actions (Behrouzi & Wong, 2011). It is importantto perform an assessment by an experienced team. The lean implementationteam might have the necessary experience, but external consultant might berequired to provide an additional beneficial perspective in the planning stage.
(9) Lean Monitoring and Controlling or Lean Sustaining (F9) – tracking, reviewingand regulating the lean implementation performance and progress. If lean imple-mentation is treated as a project, lean monitoring and controlling should beemployed along the lean planning. It is to ensure that the implementation onlean follows the plan. The process recommends preventive actions for any unan-ticipated situations. Moreover, it allows any influencing factors in lean imple-mentation to be identified (PMI, 2008). Monitoring and controlling includemeasuring of the actual lean accomplishment and comparing with the lean trans-formation plan. It can be learned from the study of Kumar and Phrommathed(2006) that absence of monitoring and controlling on lean implementationresults in failures of the lean transformation. Establishing monitoring and con-trolling mechanisms ensures the sustainability of lean performance over longterm. In some organisations, employees may attempt to return to their pre-leanmethods (Scherrer-Rathje et al., 2009).
5. Evaluation methodology for lean initiatives
The literature review revealed that each lean initiative consists of built-in elements/components. In addition, some critical success factors for lean implementation havebeen identified. These factors were taken part in lean implementation steps of the 28initiatives studied. Therefore, this paper hypothesised that the success of any lean initia-tive is contributed by two components as shown in Figure 1. The first component isrelated to the lean initiatives as it presents the association between the initiatives’elements and success factors of lean implementation (xij). This first component alsoincludes the application time (ti) and application cost (ci) of the factors, number of leanfactors (n) and initiative category (mk). A second component is related to the organisa-tional practicing of the lean initiatives. The component consists of the weight of factorimportance (wi), probability of factor success (pi), weight of understanding each factor(ui) and sustaining (τi) the employment of each factor to an organisation.
52 S. Mostafa et al.
Understanding each lean initiative is necessary for identifying any shortcomings inlean implementation applied. Selection of an initiative should be based on an efficientset of lean factors and effective evaluation rules. Here, a set of rules is proposed toevaluate the lean initiatives and their categories as follows.
SPRj ¼Xn
i¼1
xijwiuipisitici
8j (1)
ALj ¼Xn
i¼1
xijn
8j (2)
ALk ¼Xmk
k¼1
Xn
i¼1
xijnmk
8k (3)
whereSPRj success priority rate of initiative j,ALj association level of initiative j,ALk association level of category k,i success factor for lean implementation,j lean implementation initiative,k lean initiative category,xij 1, if initiative j associates factor i; 0, otherwise,wi weight for the importance of factor i to the organisation,ui weight for understanding factor i,ρi probability of success of factor i,τi sustainability of factor i measured in time units,ti application time of factor i,ci application cost of factor i,n number of lean factors,mk number of initiatives in category k.
The computation of the proposed measure of success priority rate (SPRj) requiresreal field applications. Therefore, in this paper, an evaluation analysis is carried out forthe 28 initiatives limited to the measure of association level (ALk) of five lean initiativecategories with respect to the proposed nine factors (as represented in Equation (4)).
Success of lean implementation initiative ( j )
Initiative elements Organisational practicing
xij
ci
ti
wi ui
tip
i
SPRj
ALj
ALk
n mk
Figure 1. Success of lean implementation initiative ( j ).
Production & Manufacturing Research: An Open Access Journal 53
ALk ¼X5
k¼1
X9
i¼1
xinmk
8k; j; k ¼ 1; 2; 3; 4; 5 and j ¼ 1; 2; 3; . . . 28 (4)
Table 2 represents comparisons between the presented lean initiatives according tocategory, size (number of elements in an initiative) and association with respect to thenine factors. It can be concluded after the examination that the initiative proposed byBicheno (2004) was the best initiative containing seven out of nine factors.
Table 3 presents comparison of the five categories of lean initiatives with respect tothe number of initiatives in each category (mk), association level of each category (ALk)which calculated using Equation (4), and association of each category with the ninefactors. The implementation framework category can be seen as the best associated tothe nine lean factors.
Figure 2 below presents lean factors association with lean initiative categories andwith the 28 initiatives examined. The figure shows that although reported with the high-est percentage among other factors, lean tools are moderately included (60.7%) in thetotal initiatives presented. On the other hand, lessons-learned documentation and reviewhave almost been excluded from all initiatives studied. They are found available only inthe roadmaps. It is discovered that the implementation frameworks offer the highest per-centage in the training process (32.1%), while none of the studied implementationframeworks contains lessons-learned documentation and review. The highest percentageamong the factors reported for roadmaps is for lean tools (21.4%). Nevertheless, thefigure shows that low level of lessons-learned documentation and review has beenimplemented (3.6%). Among the descriptive initiatives, expert team building is foundwith more percentage than other factors under the same initiative category. It is pre-sented that all of the descriptive initiatives studied completely lack lessons-learned docu-mentation and review. A certain percentage of lean tools is found in the conceptualframeworks (10.7%). However, the factors omitted from this category are situationalanalysis, lessons-learned documentation and review, lean assessment, and lean monitor-ing and controlling (sustaining). In the last category of lean initiatives, the assessmentchecklist, the same percentage situational analysis and lean assessment can be seen(3.6%). On the other hand, other factors are reported absent.
6. Proposed framework for lean implementation
The evaluation above revealed some shortcomings among the lean initiatives. Althoughthe implementation frameworks contained most of the lean factors, lessons-learned doc-umentation and review were rarely included. Lean monitoring and controlling, andexpert team building seemed frequently absent from the frameworks. It was found thatsome frameworks have suggested team building to be a part of lean transformation prac-tice. This idea is in line with the idea of Womack and Jones (2003) that an expert teamshould be introduced in the lean implementation plan. In most organisations, lean imple-mentation team is new to the lean concept. The team members may take a considerabletime to fully understand the concept. Effectiveness of the implementation may need torely on additional help from lean experts. Little attention has been given to thesequences of implementation of the initiatives elements. Åhlström (1998) attempted toemphasise on the natural sequences of the manufacturing tools and techniques accordingto it relationships and the availability of resources. Similarly, Bhasin and Burcher(2006) pointed out the lack of adequate project sequencing as one of the main problemsin lean implementation.
54 S. Mostafa et al.
Table 2. Individual comparison of lean initiatives.
Initiative Category Size
Lean factors
SumF1 F2 F3 F4 F5 F6 F7 F8 F9
Shingo (1989) Implementationframework
15 0 0 0 0 1 1 0 0 0 2
Smeds (1994) Implementationframework
6 1 1 1 1 0 1 0 1 0 6
Bicheno (2004) Implementationframework
12 0 1 1 1 1 1 0 1 1 7
Buus (2011) Implementationframework
17 0 1 1 1 1 1 0 0 1 6
C. Y. Wong andY. K. Wong (2011)
Implementationframework
12 0 1 0 1 1 0 0 0 0 3
Mostafa (2011) Implementationframework
15 1 1 0 1 1 1 0 1 0 6
Dombrowski et al.(2012)
Implementationframework
9 0 0 1 1 0 0 0 1 0 3
Nordin et al. (2012) Implementationframework
8 0 0 1 1 1 1 0 0 0 4
Karim and Arif-Uz-Zaman (2013)
Implementationframework
17 1 1 0 1 1 1 0 0 0 5
Powell et al. (2013) Implementationframework
24 0 1 0 1 1 1 0 1 0 5
Karlsson andÅhlström (1996)
Roadmap 4 1 0 1 0 0 0 0 0 0 2
Åhlström (1998) Roadmap 8 1 0 1 0 1 0 0 0 0 3Crabill et al. (2000) Roadmap 8 0 0 0 1 1 1 0 1 1 5Feld (2001) Roadmap 5 0 1 0 1 1 0 1 1 0 5Nightingale and Mize(2002)
Roadmap 7 1 0 0 1 1 0 1 1 5
Rivera and FrankChen (2007)
Roadmap 4 0 0 0 0 1 0 0 0 0 1
Wan and Chen (2009) Roadmap 8 0 0 0 0 1 1 0 0 0 2Anvari et al. (2011) Roadmap 5 0 1 0 1 1 1 0 1 0 5Jina et al. (1997) Descriptive 3 1 0 0 0 0 0 0 0 0 1Womack and Jones(2003)
Descriptive 4 1 0 0 0 0 1 0 0 0 2
Shah and Ward(2003)
Descriptive 3 0 0 0 0 0 0 0 0 0 0
Hobbs (2004) Descriptive 8 0 1 0 1 0 0 0 1 0 3Abdulmalek et al.(2006)
Descriptive 3 0 0 0 0 0 1 0 0 0 1
Marvel andStandridge (2009)
Descriptive 5 0 1 0 0 0 0 0 1 0 2
Monden (1998) Conceptualframework
10 0 0 0 0 1 0 0 0 0 1
Motwani (2003) Conceptualframework
7 1 0 1 1 1 1 0 0 0 5
Anand and Kodali(2010)
Conceptualframework
9 0 0 0 0 1 1 0 0 0 2
Sánchez and Pérez(2001)
Assessmentchecklist
5 0 1 0 0 0 0 0 1 0 2
9 12 8 15 17 16 1 12 4 94
Notes: 1: a factor is associated; 0: a factor is not associated; Size: number of elements in an initiative.
Production & Manufacturing Research: An Open Access Journal 55
In this paper, construction of a new framework is recommended under the imple-mentation initiatives category. This is to overcome some of the limitations of the exist-ing frameworks under the implementation framework category. This paper proposes a22-element implementation framework constructed within four phases as shown inFigures 3 and 4. The phases include conceptual, implementation design, implementationand evaluation, and complete lean transformation phase. Monitoring and controllingprocess is integrated to all phases to ensure that the expected results towards leantransformation are completely delivered. The proposed framework takes in considerationa tutorial stage to guide the lean practitioners. Accordingly, the framework comesstructured, more apprehensible and comprehensive. The four phases are explained in thefollowing section.
6.1. Conceptualisation phase
This is the kick-off phase, which selects, widens scope and trains the personnel involvedin the lean implementation. The principal data, information, and knowledge of lean aretransferred to the team. Benefits of lean to the organisation should be also explored tomake each member aware of why the lean implementation project is important.Therefore, enhancement of mind-set and understanding of lean concept can be expected.Continuous and historical lessons learned on lean, and association of lean practices withwaste types must be highly focused.
6.2. Implementation design phase
This is the warming up phase, which designs the lean plan and prepares the lean teamto the practice. This phase identifies the organisational lean current state andrequirements through various analyses. The recommended tools for this phase mainlyemphasise on decision-making process to deliver successful lean implementation. Theanalytic hierarchy process developed by Saaty (1980) can be used for measuring thedegree of association between the waste types and lean practices. Predesignedquestionnaire is developed for gauging the existing lean performance. Work sampling isa statistical-based method which can be used for evaluating the physical work. It deter-mines the relative amount of time spent on various tasks through site observation. Tovalidate the collected lean data, the findings of work sampling should be triangulatedwith the questionnaire assessment results. A well-designed questionnaire is fundamen-tally developed on iterative process and validity of the results. A cause and effectdiagram can be used to understand the main causes of each waste type. These causes
Table 3. Categorical comparison of lean initiatives of Table 1.
Category mk ALk
Lean factors
SumF1 F2 F3 F4 F5 F6 F7 F8 F9
Implementation framework 10 0.4 3 7 5 9 8 8 0 5 2 47Roadmap 8 0.39 3 2 2 4 6 4 1 4 2 28Descriptive 6 0.16 2 2 0 1 0 2 0 2 0 9Conceptual framework 3 0.29 1 0 1 1 3 2 0 0 0 8Assessment checklist 1 0.22 0 1 0 0 0 0 0 1 0 2
28 – 9 12 8 15 17 16 1 12 4 94
56 S. Mostafa et al.
Figure2.
Leanfactorsassociationwith
initiativecatego
ries.
Production & Manufacturing Research: An Open Access Journal 57
are generally grouped as manpower, machine, material, method and measurement. Thequality function deployment is another powerful tool for deeply demonstrating thelinkage between waste types and lean practices.
6.3. Implementation and evaluation phase
This is the execution phase, which delivers and evaluates the lean plan. The implemen-tation process starts with most troubled subunit of the organisation (Womack & Jones,2003). A lean pilot project is suggested to be carried out to create a prototype or a trialimplementation. The aim of the pilot project is to ensure that any expansion of leanimplementation is based on the accuracy, effectiveness and efficiency. An implementa-tion evaluation is a process in reassessing the empirical implementation strategies. The
Figure 3. The proposed framework for lean manufacturing implementation.
58 S. Mostafa et al.
evaluation can be done using the pre- and post-questionnaire assessment. The evaluationis designed to be an iterative process to validate and standardise the implementationresults.
6.4. Complete lean transformation phase
This is the final phase documenting the new lessons learned and scope changes resultedduring execution, establishment of new lean standards and planning of continuousimprovement. To accomplish lean transformation, the organisation must ensure that allnecessary changes to the established requirements are implemented. This process aims
INPUT BOX TOOL BOX OUTPUT BOX
PHASE I: CONCEPTUALISATION
Mon
itor
ing
and
Con
trol
ling
• Lean experts • Lean agents • Previous leanness index • Documented lessons
learned • Waste profile • Customer requirements
• Expert judgment • Lean knowledge • Lean preliminary analysis • Pareto analysis
• Lean expert team • Review of the lessons
learned • Waste type list • Organizational lean
practices
PHASE II: IMPLEMENTATION DESIGN
• Organisational assets • Questionnaire
requirements • Work activities details
• AHP • VSM • Gap analysis • SWOT analysis • Cause and effect analysis • QFD • Lean workshops training
and learning
• Questionnaire of lean assessment
• Documented current state gap
• Waste main root causes • Waste elimination tools • Organisational lean
expertise
PHASE III: IMPLEMENTATION AND EVALUATION
• Lean implementation teams
• Lean implementation plan • Selected unit for
implementation
• Expert judgement • Lean implementation
guidelines • Determined lean practices • Communication tools and
skills
• Lean pilot project • Lean lessons learned of the
pilot project • Preliminary evaluation
report
PHASE IV: COMPLETE LEAN TRANSFORMATION
• Change requirements • Expert judgement • Change control
• Organisational lean lessons learned documents
• Standardised lean practices • Lean scope expanding
decision
Figure 4. Tooling the proposed framework.
Production & Manufacturing Research: An Open Access Journal 59
to optimise the results of lean practice prior to the process of standardisation or futureutilisation of the practice. Expanding the scope of lean implementation is an indicator ofcontinuous improvement whereas stakeholder’s involvement at all levels must beincluded. Moreover, the standardised lean practice must be ratified by the keystakeholders.
6.5. Logic and features of the proposed framework
The notion of developing the lean implementation framework as a project-based imple-mentation has been reflected from the work of Bhasin and Burcher (2006). The aim ofthis paper is to achieve practicality of lean implementation for effective lean outputs oroutcomes of an organisation. It can be comprehended that the project process frameworkcan contribute to the accomplishment of the objective addressed. Project processes aimat satisfactorily delivering outputs of a phase and passing them as inputs to the nextphase (PMI, 2013). The processes permit lean implementation to be established insequences from the conceptual phase to the phase of completion of lean transformation.Organising lean implementation into appropriate sequences is supported by Åhlström(1998). An additional benefit of sequencing using an integration of the monitoring andcontrolling process is to ensure that the results of each element within the four phasesare delivered according to the organisational expectations. The ending of each phaseconsists of a milestone which operates as a gate for go or no-go decision toward thenext phase. No-go decision reinforces the elements inside the phase to be repeated untilthey are completed at a satisfactory level.
The proposed implementation framework aims to overcome the limitations of theexisting frameworks. The three highlighted features in the proposed framework are asfollows:
� Building the lean expert team to enhance success in lean implementation.� Lessons-learned review and documentation of lean implementation for continuous
improvement.� Lean implementation monitoring and controlling for sustaining lean outcomes.
7. Discussion and conclusions
Human element is an inherent integral component of the lean manufacturing system.Poor mind-set and misunderstanding of lean concept strongly restricts the lean imple-mentation process and reduces the expected benefits for the organisation. This notionled to an investigation on 28 lean implementation initiatives. This study discovered fivecategories of lean implementation initiatives. Efforts like roadmaps and frameworkswere found to have attempted to address the human factor. However, the most success-ful initiatives were those introduced as implementation frameworks, as proved in thispaper. Generally, a robust lean initiative is that being well-structured, tooled and com-prehensive enough to be apprehensive and understandable to the practitioners. In addi-tion, it should focus on both human and technical factors in parallel manner all times.That in turn enables getting lean benefits within short time and ensures continuousimprovement. It was evident that nine common success factors have been addressedacross the literature. However, none of the initiatives studied contains all of the ninesuccess factors. The lessons-learned review and documentation factor are highly
60 S. Mostafa et al.
omitted. The expert team building, and lean monitoring and controlling factors arerarely included.
This paper has presented two contributions. First contribution is an evaluation meth-odology that is applied on the lean initiatives studied. Second contribution is a project-based framework structured to fit lean implementation. A set of rules for evaluation hasbeen established to understand the association between the initiatives and their successfactors. Moreover, this study has established a conceptual association between the suc-cess of lean initiative, initiative elements and organisational practice through the threeconstructed formulae. To overcome the limitations of the existing frameworks, the paperhas proposed a lean implementation framework which covers all success factors foundin the previous studies. The proposed framework has integrated project-based processesand been divided into four phases. The first phase mainly involves human factor whilethe remaining three phases are mainly technical. As an updated base of lean data, infor-mation and knowledge become an essential part of the process, it must be considered inthe first phase of the proposed framework. This phase energises the continuous learningon lean, specifically for the implementation team and improves the process control.Attained leanness level should be measured, as set at end of the third phase, to verifythe results before setting new standard, which ensure the continuous improvement.
The proposed work still evokes extension and field application. For future research,the authors recommend a validation of the proposed framework and exploitation of allpossible tools guided in the tooling of the project processes. An advanced learningmethod should be added to make the lean implementation serve the vision, mission,objectives, goals and targets of the organisation.
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